【摘要】 采用氧化增重法、X射线衍射、扫描电子显微镜研究了不同溶解氧浓度下700℃级超超临界锅炉用GH2984镍基合金的750℃饱和蒸汽氧化行为,结果表明:GH2984合金在不同溶解氧浓度（10μg/L、5mg/L）的水蒸汽中生成的氧化层均为单层结构,主要由连续Cr₂O₃组成。加氧处理会造成GH2984合金氧化膜厚度增加和内氧化现象明显,并使得表面零散分布的Fe₂O₃瘤状凸起消失,转而生成更多富Cr瘤状凸起。另外,水中溶解氧浓度上升未引起GH2984合金表面Cr₂O₃氧化膜的加速挥发,但促进了Cr₂O₃氧化膜中少量Al₂O₃和TiO₂内氧化物的形成。更多还原

【Abstract】 The saturated vapor oxidation behavior of GH2984 alloys at 750 °C were investigated by oxidation weight increasing method, X-ray diffraction and scanning electronic microscopy in different dissolved oxygen concentrations. The results show that the oxide film of GH2984 alloys in different dissolved oxygen concentrations is of a single layer consisting of continuous Cr₂O₃. The oxidation mass gain of GH2984 alloys slightly increases with the increase of the dissolved oxygen concentrations in water vapor. Oxygenated treatment could accelerate the internal oxidation phenomenon, enhance the oxidation film thickness and make the scattered nodular bulges of Fe₂O₃ disappear and more Cr-rich nodular bulges form. Moreover, high dissolved oxygen concentrations do not affect the stabilization of Cr₂O₃ but contribute to the formation of a little Al₂O₃ and TiO₂ which are oxidized internally.更多还原